Loki |You, his loving Jotün daughter, wanted a cat. Of course, Loki denied, the fluff ball would puke and its litter box would need changing.

Alas, he wasn't the one who made a decision. Thor brought a cat to you and Loki with all the supplies, including a self cleaning litter box.

Bucky| The Assasin actually had to get a cat to be his Emotional Service Animal, you were just along for the ride.

Thor| After getting Loki and his daughter a cat he decided to get one for the heir of Asgard, you, to help you in your studies.